Immature development and adult eclosion of Ufens principalis Owen (Hymenoptera

Trichogrammatidae), an egg parasitoid of Homalodisca spp. (Hemiptera: Cicadellidae) in southern California

A. K. Al-Wahaibi, J. G. Morse

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The biology of the immature stages and adult eclosion of Ufens principalis Owen, an important parasitoid of Homalodisca eggs in southern California, were studied. The duration of the egg, larval and pupal stages at 26.7C were 0-1, 7 and 9 days, respectively. Sacciform larvae, which developed gregariously within host eggs, were motile until about five days of age, and then became sessile. Parasitized host eggs changed from whitish and soft when freshly-laid to yellow-orange and hard at five days and older. This change was accompanied by formation of septal walls separating the mature larvae and pupae. The rate of immature development had a strong positive linear relationship (R 2=0.853, n=98) with temperatures in the range of 20.0-30.3C. The theoretical minimum threshold for immature development was 13.5C, and the required heat units were 241.0 degree-days. Adult eclosion from host eggs occurred mostly (85%) on the first two days of emergence. Although most females emerged during the morning hours (0600-1200 h), males tended to emerge earlier than females with equal emergence during the morning and late night hours (2400-0600 h). The rate of successful adult emergence was high (88%). The ratio of eclosed adults to the number of exit holes was 1.18, indicating that most adults tended to independently cut their exit holes. The number of exit holes had a strong negative relationship (R2=0.711, n=125) with exit hole size, suggesting that larger numbers of developing immatures per host egg result in an overall decrease in adult size.

Original languageEnglish
Pages (from-to)467-479
Number of pages13
JournalBulletin of Entomological Research
Volume100
Issue number4
DOIs
Publication statusPublished - Aug 2010

Fingerprint

Homalodisca
Hemiptera
Hymenoptera
Trichogrammatidae
Cicadellidae
Eggs
Ovum
eclosion
immatures
Larva
Pupa
larvae
heat sums
Hot Temperature
pupae
Temperature
heat
Biological Sciences
duration

Keywords

  • adult size
  • behaviour
  • biological control
  • degree-days
  • glassy-winged sharpshooter
  • gre garious parasitoids
  • life cycle
  • morphometrics
  • smoke-tree sharpshooter
  • temperature
  • temporal distribution

ASJC Scopus subject areas

  • Insect Science
  • Agronomy and Crop Science
  • Medicine(all)

Cite this

@article{b3dcb9017435440bb5eaf33646fa926d,
title = "Immature development and adult eclosion of Ufens principalis Owen (Hymenoptera: Trichogrammatidae), an egg parasitoid of Homalodisca spp. (Hemiptera: Cicadellidae) in southern California",
abstract = "The biology of the immature stages and adult eclosion of Ufens principalis Owen, an important parasitoid of Homalodisca eggs in southern California, were studied. The duration of the egg, larval and pupal stages at 26.7C were 0-1, 7 and 9 days, respectively. Sacciform larvae, which developed gregariously within host eggs, were motile until about five days of age, and then became sessile. Parasitized host eggs changed from whitish and soft when freshly-laid to yellow-orange and hard at five days and older. This change was accompanied by formation of septal walls separating the mature larvae and pupae. The rate of immature development had a strong positive linear relationship (R 2=0.853, n=98) with temperatures in the range of 20.0-30.3C. The theoretical minimum threshold for immature development was 13.5C, and the required heat units were 241.0 degree-days. Adult eclosion from host eggs occurred mostly (85{\%}) on the first two days of emergence. Although most females emerged during the morning hours (0600-1200 h), males tended to emerge earlier than females with equal emergence during the morning and late night hours (2400-0600 h). The rate of successful adult emergence was high (88{\%}). The ratio of eclosed adults to the number of exit holes was 1.18, indicating that most adults tended to independently cut their exit holes. The number of exit holes had a strong negative relationship (R2=0.711, n=125) with exit hole size, suggesting that larger numbers of developing immatures per host egg result in an overall decrease in adult size.",
keywords = "adult size, behaviour, biological control, degree-days, glassy-winged sharpshooter, gre garious parasitoids, life cycle, morphometrics, smoke-tree sharpshooter, temperature, temporal distribution",
author = "Al-Wahaibi, {A. K.} and Morse, {J. G.}",
year = "2010",
month = "8",
doi = "10.1017/S0007485309990484",
language = "English",
volume = "100",
pages = "467--479",
journal = "Bulletin of Entomological Research",
issn = "0007-4853",
publisher = "Cambridge University Press",
number = "4",

}

TY - JOUR

T1 - Immature development and adult eclosion of Ufens principalis Owen (Hymenoptera

T2 - Trichogrammatidae), an egg parasitoid of Homalodisca spp. (Hemiptera: Cicadellidae) in southern California

AU - Al-Wahaibi, A. K.

AU - Morse, J. G.

PY - 2010/8

Y1 - 2010/8

N2 - The biology of the immature stages and adult eclosion of Ufens principalis Owen, an important parasitoid of Homalodisca eggs in southern California, were studied. The duration of the egg, larval and pupal stages at 26.7C were 0-1, 7 and 9 days, respectively. Sacciform larvae, which developed gregariously within host eggs, were motile until about five days of age, and then became sessile. Parasitized host eggs changed from whitish and soft when freshly-laid to yellow-orange and hard at five days and older. This change was accompanied by formation of septal walls separating the mature larvae and pupae. The rate of immature development had a strong positive linear relationship (R 2=0.853, n=98) with temperatures in the range of 20.0-30.3C. The theoretical minimum threshold for immature development was 13.5C, and the required heat units were 241.0 degree-days. Adult eclosion from host eggs occurred mostly (85%) on the first two days of emergence. Although most females emerged during the morning hours (0600-1200 h), males tended to emerge earlier than females with equal emergence during the morning and late night hours (2400-0600 h). The rate of successful adult emergence was high (88%). The ratio of eclosed adults to the number of exit holes was 1.18, indicating that most adults tended to independently cut their exit holes. The number of exit holes had a strong negative relationship (R2=0.711, n=125) with exit hole size, suggesting that larger numbers of developing immatures per host egg result in an overall decrease in adult size.

AB - The biology of the immature stages and adult eclosion of Ufens principalis Owen, an important parasitoid of Homalodisca eggs in southern California, were studied. The duration of the egg, larval and pupal stages at 26.7C were 0-1, 7 and 9 days, respectively. Sacciform larvae, which developed gregariously within host eggs, were motile until about five days of age, and then became sessile. Parasitized host eggs changed from whitish and soft when freshly-laid to yellow-orange and hard at five days and older. This change was accompanied by formation of septal walls separating the mature larvae and pupae. The rate of immature development had a strong positive linear relationship (R 2=0.853, n=98) with temperatures in the range of 20.0-30.3C. The theoretical minimum threshold for immature development was 13.5C, and the required heat units were 241.0 degree-days. Adult eclosion from host eggs occurred mostly (85%) on the first two days of emergence. Although most females emerged during the morning hours (0600-1200 h), males tended to emerge earlier than females with equal emergence during the morning and late night hours (2400-0600 h). The rate of successful adult emergence was high (88%). The ratio of eclosed adults to the number of exit holes was 1.18, indicating that most adults tended to independently cut their exit holes. The number of exit holes had a strong negative relationship (R2=0.711, n=125) with exit hole size, suggesting that larger numbers of developing immatures per host egg result in an overall decrease in adult size.

KW - adult size

KW - behaviour

KW - biological control

KW - degree-days

KW - glassy-winged sharpshooter

KW - gre garious parasitoids

KW - life cycle

KW - morphometrics

KW - smoke-tree sharpshooter

KW - temperature

KW - temporal distribution

UR - http://www.scopus.com/inward/record.url?scp=77955848441&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77955848441&partnerID=8YFLogxK

U2 - 10.1017/S0007485309990484

DO - 10.1017/S0007485309990484

M3 - Article

VL - 100

SP - 467

EP - 479

JO - Bulletin of Entomological Research

JF - Bulletin of Entomological Research

SN - 0007-4853

IS - 4

ER -